Technical FM Aerial Amplifier Location on 500c

[Peteb101]

Does anyone know where the FM amplifier / booster is located on a 2105 (pre facelift) 500c Abarth please, the aerial is located in the OSR window? I have swapped out the original Head Unit with a Pioneer double din (using the Connects2 kit) but the FM/AM reception is now rubbish (it is fine with the OEM unit). There does not seem to be a power trigger in the car harness at the back of the radio so wanted to find the booster and check what was going on there in case it is ignition fed or maybe Can Bus triggered (unlikely I think) . Thanks